An evaluation of irrigation-yield repsonse models for use with wheat & barley in Canterbury, New Zealand

dc.contributor.author

Baird, John R.

dc.date.accessioned

2010-02-14T22:27:33Z

dc.date.available

2010-02-14T22:27:33Z

dc.date.issued

1986

dc.identifier.issn

0112-5062

dc.identifier.uri

https://hdl.handle.net/10182/1381

dc.description

New Zealand Agricultural Engineering Institute

en

dc.description.abstract

This study evaluated the ability of nine models to describe and
predict the response of grain yield to flood irrigation of wheat and
barley crops. The models may be divided into four groups:
1). Input-Output models
2). Potential Deficit models
3). Non-phasic Actual Deficit models
4). Phasic Actual Deficit models. Potential evapotranspiration, adjusted for crop cover, was calculated
daily using the Penman formula. The timing of the different stages of
development required for the phasic models was based on elapsed
photothermal time from sowing.
The input-output models were least successful in describing the
response of yield to irrigation. There was little difference between
the other models in the amount of variation explained. On average,
both crop species produced about 300 kg (grain)/ha per irrigation or 8
kg (grain)/ha per mm of net water received. The potential and actual
deficit models showed early sown crops to produce a response of 5-12
kg (grain)/ha per mm of irrigation applied when needed. The phasic
models showed that the sensitivity of different developmental phases
to drought varied erratically with sowing date.
The predictive ability of the models was tested on four independent
experiments. The potential deficit and non-phasic actual deficit
models accurately predicted small responses to irrigation of less than
20% but were less accurate at predicting larger responses of up to 100%. These models adequately describe the response of wheat and
barley yield to irrigation in Canterbury.

en

dc.language.iso

en

en

dc.publisher

Lincoln College, University of Canterbury

en

dc.relation.ispartofseries

Agricultural Engineering Thesis no. 5

en

dc.rights.uri

https://researcharchive.lincoln.ac.nz/page/rights

dc.subject

wheat

en

dc.subject

barley

en

dc.subject

input-output models

en

dc.subject

potential deficit models

en

dc.subject

actual deficit models

en

dc.subject

phasic actual deficit models

en

dc.subject

evapotranspiration

en

dc.subject

evaporation

en

dc.subject

flood irrigation

en

dc.subject

crop cover

en

dc.subject

soil water

en

dc.subject

photothermal time

en

dc.subject

prediction

en

dc.subject

yield

en

dc.title

An evaluation of irrigation-yield repsonse models for use with wheat & barley in Canterbury, New Zealand

en

dc.type

Thesis

en

thesis.degree.grantor

University of Canterbury

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thesis.degree.level

Masters

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thesis.degree.name

Master of Applied Science

en

dc.subject.marsden

Fields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300200 Crop and Pasture Production

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